Method and apparatus for optically recording color picture information on a photographic medium



United States Patent [72] Inventors l'eterQ Gold aIkJ fl William E., Jr.Glenn, Stamford, Connecticut [2]] Appl. No. 717,682

[22] Filed April l, 1968 [45] Patented Oct. 27, 1970 [73] AssigneeColumbia Broadcasting Systems, Inc.

New York, New York a corporation of New York 54 METHOD AND APPARATUS ronOIY'IICALLY v RECORDING COUOR PICTURE INFORMATION Primary Examiner-JohnM. Horan Attorney-Brumbaugh, Graves, Donohue & Raymond prised ofadjacent strip images of the various color components in thecorresponding original scene area, formed by passing the original sceneimage through the banded filter. :Those areas are focused by alenticular lens array onto the image plane of the medium. Imaged insuperimposed relation to the color strip images is a series ofalternating, relatively contrasting areas, such as in the form of spacedparallel lines, having a constant transverse spatial periodicity whichis onehalf that of the periodicity of the color strip images.

To form the latter series of elongated areas, either the average lightfrom the scene to be recorded or light from an independent source isused to form an elongated image having a transverse dimension one-halfthe corresponding dimension of the banded color filter. That image isprojected onto the lenticular array to result in the formation of alatent image of the latter series of elongated areas (or lines)irrespective of variations in the luminance content of the originalscene.

atented 'oct. 27, 1970 3,535,992

Sheet 1 of? 1 F/a/ -3 76 I4 F/aa FIG. 6

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Patented Oct. 27, 1970 Sheet 3 zmwmo zwwmw ME -m I N VliNTORS. PETER C.GOLDMARK 8 WILLIAM E. GLEN By M, .m I

ATTORNEYS their METHOD AND APPARATUS FOR OPTICALLY RECORDING COLORPICTURE INFORMATION ON A PI-IOTOGRAPI-IIC MEDIUM BACKGROUND OF THEINVENTION This'invention relates to the optical recording of colorpicture information in a coded format on a photographic medium and, moreparticularly, to a method and apparatus for optically recording suchinformation as superimposed records of a reference carrier signal andaphase and amplitude modulated color carrier signal at a differentfrequency, whereby both carriersmay be reproduced by television scanningtechniques to develop video color signals.

In U.S. Pat. application Ser. No. 375,469, filed June 16, 1964, nowabandoned, by Goldmark and Gabor for Color Picture Information Recordingand Reproducing System there is disclosed a technique by which colorpicture information may be recorded on a record medium, such as aphotographic film. There, the original scene is scanned with atelevision' camera to produce a chrominance signal-for example, the Iand Q components of an NTSC color television signal. The I and Qcomponents of the chrominance signal are used to modulate the amplitudeand phase of a color carrier signal which is used to vary the intensityof a recording beam, tracing out a raster pattern on the film, accordingto the amplitude of the modulated color carrier signal. In addition, therecording beam is simultaneously modulated with both the luminancecomponent of the picture and a pilot, or reference, carrier signal at afrequency which is a multiple or submultiple, and preferably one-half,of the frequency of the color carrier. Both carriers are multiples ofthe line-scanning rate so that the cycles of the respective pilot andcolor carriers tend to be aligned in a common direction in the frame,thereby tending to form series of mutually spaced lines in each filmframe.

To reproduce a color television signal from the film, the film issimilarly scanned to reproduce the luminance component and the modulatedcolor carrier and pilot signals, which may be combined in a demodulatorto recover the I and Q modulating components for application to aconventional television receiver. The luminance component, which isrestricted to a lower bandwidth than the color carrier sidebands, isrecovered by conventional filtering.

In copending U.S. Pat. application Ser. No. l9,l06, filed .Ian. 6, I966,now abandoned of Goldmark et al. for Color Film Recording andReproducing Apparatus" the color picture information is recorded in themanner briefly outlined above, but the luminance component is separatelyrecorded in an adjacent portion or frame of the record medium. Theluminance component of the scene, as there disclosed, may be recordedeither optically (i.e., photographically) or electronically.

SUMMARY OF THE INVENTION The present invention provides a method andapparatus by which recordation of color picture information in theformat described above may be accomplished entirely optically, withoutthe need of electronic equipment. As a result, a photographic medium canbe exposed with latent images in a photographic camera and, aftersuitable chemical processing, can be scanned to develop the pilot andmodulated color carrier signals.

In brief, this is accomplished by exposing the photographic medium withan optical image of a first series of mutually spaced parallel lines, orelongated areas, having a constant transverse periodicity and convertingthe image of the original scene into a second series of parallelelongated image areas of which each contains at least two strips havingadjacent portions providing displaced images of different colorcomponents inthe corresponding area of the scene. The transverse spatialperiodicity of the second series is different from the constantperiodicity of the first series, and each strip within the areas of thesecond series has a predetermined spatial relationship with respect tothe other strips in the same areas, and

also with respect to the images of the first series of areas. The firstseries of elongated areas forms a record of the pilot carrier, whereasthe second series of elongated areas forms a record of the color carrierin which each strip image within the second series of image areas variesin intensity according to the color content in the original scene. Thus,the strips within each area form an analog of a phase andamplitude-modulated color carrier signal.

In a preferred embodiment of apparatus for carrying out the invention, aspecial camera may be provided with a banded color filter carryingprimary color filter bands which are imaged onto the image plane of thephotographic medium by an array of elongated lenticular lenses. Thefirst series of elongated image areas forming the pilot carrier recordmay be formed by imaging onto each lenticule of the lens array an imageof an area illuminated by the average light in the scene beingphotographed or by an independent light source. Therefore, a series ofparallel lines representing a record of the pilot carrier will be formedin superimposed relation to the color carrier record irrespective of thepresence or absence of light in portions of the original scene.

For a better understanding of the invention, together with the objects,advantages and further aspects thereof, reference may be made to thefollowing detailed description, in conjunction with the drawings, inwhich:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of arepresentative film produced in accordance with the invention;

FIG. 2 is a schematic side elevation in cross section of a photographiccamera in accordance with the invention;

FIG. 3 is a front elevation of a portion of the camera of FIG. 2,showing the location of the banded color filter;

FIG. 4 is a plan view of the banded color filter shown in FIG. 3,illustrating its relationship to the lens and iris assembly of the FIG.2 camera;

FIG. 5 is a schematic depiction of a hypothetical color image useful inexplaining the invention; 7

FIG. 6 is a diagrammatic representation of a photographic image producedby the FIG. 2 camera from the hypothetical image of FIG. 5;

FIG. 7 is a series of graphs helpful in explaining the interrelationshipof the various elements of the image of FIG. 6;

FIG. 8 is an exploded schematic side elevation in cross section of theelements of a banded filter of the type shown in FIG. 4, indicating thepositional relationship between the filter elements;

FIG. 8A is a diagrammatic representation of the positional relationshipof the monochrome images formed on photographic film by the filterelements of FIG. 8 for various color components; and

FIGS. 9 and 10 are schematic side elevations in cross section ofalternate constructions of the FIG. 2 camera.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 illustrates a preferredformat of a monochrome film containing a record of color pictureinformation which may be reproduced by television-scanning techniques.This film is described in detail in copending U.S. Pat. application Ser.No. 519,106 mentioned above. The film comprises a conventionaltransparent cinematographic strip 10, which may have sprocket holeperforations 12, and contains adjacent frames or frame areas l3, l4.Recorded in each frame 13 is a monochrome image of the luminance contentin the original color picture scene, whereas the frames 14 contain anencoded monochrome representation of the color content of the scene.Specifically, each color frame 14 contains a first record of a colorcarrier modulated in amplitude and phase in accordance with colorsaturation and hue, respectively, in the original scene, and issuperimposed on a second record of a pilot carrier, preferably at afrequency of one-half the color carrier frequency.

The color carrier is formed by a series of elongated, essentiallyparallel image areas, or image lines, having a constant nominalspatialperiodicity, i.e., the number of lines repeated per unit distance normalto the lines. Each of the color image areas is comprised of elementalportions of which the transverse position (normal to the direction ofelongation) varies in accordance with the color content of the originalscene. This, it will be recognized, is similar to the record which wouldhave been recorded using a scanning beam modulated in phase inaccordance with the color content. When the color content oftransversely adjacent elemental portions of the original scene changesfrom one hue to another hue, the phase of the carrier is shiftedaccordingly, as in an NTSC chrominance signal. In FIG. 1, the pilot andcolor carrier lines, shown only diagrammatically, are designated by thenumeral 16.

FIG. 2 depicts an optical camera for recording the luminance and colorframes 13, and 14 on the photographic medium, or film 10. For purpose ofexplanation, it may be assumed that the film is supported and advancedthrough the camera in a conventional manner, and that the camera may beof the still or motion picture type. Therefore, only those portions ofthe camera pertinent to the discussion are illustrated.

The film 10 is maintained in close contact with a pair of adjacent frameimage areas, or gates 18, 20, by a pressure plate 22 of conventionaldesign. The incoming image is directed through an adjustable slit iriscomprised of a pair of rotatable blades 24, which can be varied to widenor narrow the dimension of the slit through which light is received.Immediately below the iris blades 24 is a lens 25 (or lens system) whichpasses the incoming image to an inclined mirror filter 26 cornprised ofa series of banded filter elements, which convert the incoming imageinto a series of elongated parallel image areas each containing adjacentstrip images of a selected color component in the original scene.

From the banded color filter 26 the converted image passes into achrominance image chamber 28 formed between the structural walls 29, 30of the camera. There, the convened image passes through a glass prism 31and strikes a mirrored surface 32, which projects the image toward theimage plane of the film 10. The end of the prism is formed as a lens 34comprised of an array of elongated lenticular elements. As best seen inthe illustration of FIG. 6, each of the lenticular elements isessentially a plane-convex cylindrical lens 35 receiving an image of aportion of the original scene viewed by all of the dichroic elements inthe filter 26 and focuses it on the image plane of the film 10.Preferably the filter 26 is located close to the plane of the lens 25 sothat every part of the original scene passes through all elements of thefilter, and is projected by the mirror surface 32 onto a correspondinglenticule of the lens 34. Each such narrow part of the original sceneimage is therefore divided by the filter 26 into several adjacent stripimages of different colors and focused on the film.

A portion of the light in the image entering the slot between the irisblades 24 and passing through the lens 25 passes through the dichroicelements of the filter 26 into a luminance image chamber 33 formedbetween the interior wall 29 and the wall 36 of the apparatus. A portionof any white light in the scene is reflected, as previously explained,to the mirror 32 by the dichroic filter elements, the remaining portionbeing transmitted through the film gate area 18 to the image plane ofthe film where a latent image of the luminance component of the scene isformed. It will be noted that inasmuch as certain of the colorcomponents in the scene image are reflected by the dichroic elements ofthe filter, the intensity of the luminance image will be reduced but,nevertheless, satisfactory. It is understood, of course, that additionaloptical elements, such as a lens or prisms, would be ordinarily requiredto lengthen or shorten one of the effective optical paths between thelens 25 and the plane of the film 10 in order that the latent imagesformed on the film beneath the gates 18, are both properly focused. Forexample, the prism 31 may be effective for this purpose.

FIGS. 3 and 4 illustrate in more detail the arrangement of the dichroicelements on the filter 26. The filter 26 comprises two series ofadjacent dichroic mirrors, each series including a red-reflecting mirror38, a blue-reflecting mirror 39 and a 5 green-reflecting mirror 40. Thedichroic elements 38-40 of the filter 26 form the series of elongatedimage areas on the lenticular lens 34, each area of which containsadjacent red, blue and green image strips resulting from the reflectionof colored light in the original scene from the individual dichroicmirrors 38-40. Of course, where there is an absence of a particularcolor component in the original scene, no corresponding image will beformed by the dichroic filter elements. The spacings between the centersof the dichroic mirrors 38-40 represent the transverse spatialdisplacement of the cycles of a carrier signal modulated in phase bychrominance information in the original scene if the carrier wererecorded by a transversely scanning modulated recording beam.

When forming the luminance image in the frame image area 13 below thegate 18, not all of the white light components are transmitted by thevarious dichroic mirrors, as already mentioned. Since, however, whitelight (luminance) contains one of each of the primary colors red, blueand green, each dichroic mirror will transmit the two primary colors notreflected by the mirror. Thus, for example, the red mirror transmitsblue and green (cyan), the blue dichroic mirror transmits green and red(yellow), whereas the green mirror 40 transmits red and blue (magenta).As a result, the latent image of the luminance component of the originalscene on the film 10 will have a reduced intensity, but a generally trueluminance image will be presented.

ln this connection, the combination of film response and filtertransmission should be chosen to approximate the luminance (Y) and colorcomponent characteristics used in the color television system. In theNTSC system, the combination of filter and film responses should producecolor carrier amplitudes in the chrominance frame of the film or 59percent, 63 percent and 45 percent for a color saturation of 75 percentof green, red and blue, respectively. In addition, since lighttransmissivity in the optical paths between the original scene and theluminance and chrominance frames can be different, the photosensitiveemulsion of the film can be provided with correspondingly different ASAor DIN ratings, or with different spectral responses, to compensate forany discrepancies.

For producing images of the pilot carrier lines superimposed on theseries color carrier lines, an opaque mask 42 having light reflectiveareas 44, of which the transverse dimension is one-half the totaltransverse dimension of the filter 26, is located in the filter plane.The light-reflective areas 44 may be comprised of, for example, alight-diffusing, opaque white paint or alluminized ground glass so thatlight, or luminance, from the whole scene viewed by the camera isaveraged. Since light reflected from the areas 44 is diffuse, onlycertain of the light rays, namely, those connecting the individuallenticules 35 and the areas 44 will be seen by the lenticular lens 34.Moreover, the image of the areas 44 seen by the lens 34 will appear as acontinuous white bar in superimposed relation to the images of the colorfilter 26 because of the diffuseness of the light in a directionparallel to the lenticules 35 of the lens. When recorded, the images ofthe reflective areas 44 form a series of spaced parallel areas or linesrepresenting the pilot or reference carrier used in decoding the phasemodulated color carrier.

It is important to recognize that the pilot or reference carrier linesmust be present throughout each chrominance frame 14 of the film inorder to have present a reference carrier when the film is reproduced byscanning. The reference carrier maintains synchronisrn of thedemodulating circuits of the reproducing apparatus with the reproducedphase-modulated color carrier. Since the reflective areas 44 on the mask42 do not form an image of the original scene, but rather areilluminated by the average light content of the scene, no image of thescene is formed by the areas 44 for projection onto the lenticular lens34. For this reason, totally black areas in the scene, or areas lackinga red, green or blue color component, will not result in a correspondingabsence mispositioning, or broadening of the reference carrier lines, aswould happen if a mask were in a common optical path with the colorfilter. Thus, by placing the image-forming reflective areas 44 in adifferent optical path between the original scene and the image plane ofthe film, the reference carrier lines are unaffected by the color orluminance content of portions of the original scene.

FIG. 6 represents diagrammatically the monochrome image formed in thechrominance frame of the film when viewing the hypothetical scenedepicted in FIG. 5. For purpose of explanation, the scene is assumed toconsist of adjacent horizontal red, blue and green stripes. When thisscene is projected onto the banded color filter 26, the red stripe isreflected to the mirrored surface 32 by only the red dichroic mirrors38, the blue stripe by only the blue dichroic mirrors 39, and the greenstripe by only the green dichroic mirrors 40. In FIG. 6, the monochromeimage representing the red stripe is a series of transversely spacedelements 46, whereas the blue stripe is represented by a similar seriesof elements 48 displaced from the elements 46 and the green stripe imageresults in a series of elements 50 displaced from the elements 46 and48. Superimposed on the monochrome representation of the color scene arethe lines 52, constituting a record of the reference carrier formed bythe reflective areas 44 of the mask 42.

FIG. 7 shows the idealized electrical signals which would be developedby transversely scanning the monochrome images of FIG. 6. Graph aindicates that the pilot carrier will be a symmetrical square wavesignal having maximum and minimum levels of equal duration. Thischaracteristic of the resulting electrical pilot signal is desirablebecause it minimizes the even harmonic, which would interfere with thecolor carrier frequency f The fundamental component of the pilot carrierat a frequency f, M is shown by the broken line in 'graph a. Graphs b, cand d illustrate the idealized electrical signals that would result fromtransverse scanning of the elements 46, 48 and 50, respectivelyrepresenting the red, blue and green portions of the scene. Thefundamental components of the frequency f of the square wave electricalsignals is depicted by the sine wave shown in broken lines andsuperimposed on the square wave signals. 1

From a comparison of the relative phases of the carrier fundamentallyderived from scanning the red, blue and green monochrome images, it canbe seen that the phase of the color carrier for a red color componentleads the phase of the carrier representing a blue color component.Similarly, the phase of the color carrier for the blue color component,leads the phase of the color carrier signal for a green color component.At the same time, the phases of the color carrier signal for the variousprimary color components bear a fixed relation to the phase of the pilotcarrier, which is at one-half the frequency of the color carrier.

FIG. 8 shows an alternate arrangement of the dichroic mirror elementscomprising the filter 26, in which the individual dichroic mirrors 38are in overlapping, rather than abutting, relationship. Each of themirrors has a width equal to one-half the center-to-center spacingbetween adjacent mirrors for the same color, and this width represents180 electrical degrees of the color carrier signal. The center-to-centerspacing between adjacent red and blue mirrors 38', 39 is 1 16.6, betweenthe blue and green dichroic mirrors 3940 it is 106.2. and between thegreen and red mirrors 40, 38' it is 137.2 The center of the red filter38 is displaced from the center of the surface 42 forming images of thereference carrier lines by 69.16 The diagram of F IG. 8A illustrates thepositions of maximum intensity of the monochrome color carrier recordfor various color components in an original scene image passing throughthe dichroic mirrors 38 -40. The specific electrical angles givenaboveare compatible with the color phases of an NTSC color signal. However,other positional relationships among the dichroic mirrors, or otherfilter inches. The transverse dimension of the reflective or lighttransmitting surfaces 44 of the mask 42 in such case would be about.0715 inches. Again, the above values are merely representative and, ofcourse, depend upon the particular optical system used in the camera.

FIG. 9 shows an alternate embodiment of the FIG. 2

, camera, in which the color filter 26 is disposed immediately adjacentthe lens 25. In this case, a half-silvered mirror 60 at an angle of tothe plane of the filter 26 receives the converted image and reflects itto the prism 31 and mirrored surface 32 for projection onto thelenticular lens 34' The lens 34 in this case is in the form of alenticular lens plate. The luminance component of the original scene, asbefore, passes through the lens 25, and color filter 26, and from there,to the film gate 18 for exposing the frame 13. In this connection, itshould be noted that the chrominance frame 14 also contains a luminanceimage in superimposed relation to the pilot and color carriers. However,inasmuch as the luminance signal is I restricted to a bandwidth separatefrom the bandwidth of the color carrier sidebands, the resultingluminance signal derived from scanning the chrominance frame 14 can beremoved from the composite color signal by conventional filtering.

For forming the series of elongated images representing the pilotcarrier in the apparatus of FIG. 8, a source of illumination 62 ismounted in a small chamber 64 adjacent the wall 36 of the luminancechamber 33. The source 62 is energized in synchronism with the shutter(not shown) by a shutter switch 66 that closes momentarily to connect acurrent source, such as the battery 67, to the light source 62 each timea frame is exposed. This results in a momentary flashing of the light62. Illumination then passes through a suitable lens 68 and slotted mask70 of ground glass, for example, to the mirrored surface v synchronism.To this end, the camera 32, where an image of the mask is formed forprojection onto the lenticular lens 34' In FIG. 10, showing a furtheralternative embodiment of the camera, two separate lenses 72, 74 areused to image the luminance and chrominance components in the scene ontothe frame areas 13 and 14, respectively. As in the FIG. 8 embodiment,the color filter 26 is disposed very close to and immediately behind thelens 74 in the chrominance image chamber 28. The advantage of the FIG. 9embodiment is that the luminance image passes directly to the imageplane of the film 10 without alternation by the color filter 26.

Synchronization marks (FIG. 1 can also be recorded on the film 10 duringexposure of the frames l3, 14. The synchronizing marks can be sensedduring reproduction to develop a signal to maintain the film motion andvertical scanning rate in can be provided with a flexiblelight-transmissive tube 78 that accepts light from the scene when thecamera shutter opens and transmits it to the plane of the film 10. Theend 79 of the light-transmitting tube is located immediately above thephotosenistive side of the film at a location to place the synchronizingmark 76 in a preselected position with respect to each pair of frames.

Although the invention has been described with reference to specificembodiments and methods, certain modifications and variations will occurto those skilled in the art. Thus, alternate approaches for opticallyrecording color information in the format described are available. It ispossible to obtain identical results in using, for example, the cameraof FIG. 9 in combination with a film of which the portion passingunderneath the chrominance film gate 20 includes an integrally embedded,banded color filter. In such case the lens 34 and filter 26 are not usedand the film itself may be lenticulated u have below each lenticule aseries of color filters arranged m the manner shown in FIGS. 3 and 4. Alatent image of the pilot carrier can be prerecorded on the film, or inthe alternative, one of the masks described can be implemented to forman image of the pilot carrier lines. Also, it is possible to employ afilm having sprocket holes in the intermediate strip between the framesl3, 14, if desired.

Accordingly, all such modifications and variations are intended to beincluded within the scope of appended claims.

I claim:

1. In a method for recording color picture information from an originalscene on a monochrome photographic medium in a coded format, the stepsof:

exposing a frame area of the medium with an optical image of a firstseries of mutually spaced elongated areas of illumination to form in theframe area a record of a like first series of continuous parallelcontrasting lines irrespective of variations in the luminance contentbetween portions of the original scene, the first series having aconstant spatial periodicity;

converting an image of the original scene into a second series ofparallel elongated image areas corresponding to elongated image areas inthe original scene having a spatial periodicity different from saidconstant periodicity of the first series, the areas of the second seriesbeing comprised of at least two strips having adjacent portionsproviding displaced images of different color components in thecorresponding area of the scene; and

exposing the frame area of the medium to said second series of images torecord them in superimposed parallel relation to the recorded lines ofthe first series.

2. A method as defined in claim I, in which the dimension of theadjacent portions of the strips, normal to the parallel direction, areunequal.

3. A method as set forth in claim 1, in which the strip imagescomprising the second series of elongated areas are in overlappingrelationship.

4. A method as set forth in claim 1, in which the transverse dimensionsof the elongated areas of illumination of the first image series aresubstantially equal.

5. A method as defined in claim 1, in which the first and second seriesof areas are recorded simultaneously.

6. A method as defined in claim 1, in which the first and second seriesof areas are recorded sequentially.

7. A method according to claim 6, in which the photographic mediumincludes an arrangement of color filter areas by which the originalscene image is converted into the second series of elongated imageareas.

8. A method according to claim 7, in which the first series of elongatedareas is recorded on the photographic medium prior to exposure to thesecond series of elongated images.

9. A method according to claim 1, in which the strips of the elongatedareas of the second series representing respective single colorcomponents are repeated at least once in mutually spaced transverserelation to form respective second strip images within each area of aportion of the corresponding area of the original scene.

10. A method as defined in claim 1, in which the transverse dimension ofthe elongated areas of illumination of the first series is aboutone-half the corresponding dimension of the areas of the second series.

11. Apparatus for optically recording color picture information from anoriginal scene on a monochrome photographic medium in a coded format,comprising:

optical means for directing to a frame area of the medium an opticalimage of a first series of spaced elongated areas of illumination toform in the frame area a record of a like series of continuous, parallelcontrasting lines irrespective of variations in the luminance contrastbetween portions of the original scene, said lines having a constanttransverse spatial periodicity;

color selective means disposed to receive an image of the original scenefor converting such image into a second series of elongated image areascorresponding to elongated areas of the original scene and having aspatial periodicity different from said constant periodicity of thefirst series;

the areas of the second series being comprised of a plurality of imagestrips having adjacent portions providing displaced images of differentcolor components in the corresponding area of the scene; and

lens means for focusing the image areas of the second series onto theframe area of the medium in superimposed parallel relation to theexposing image of the first series of areas.

12. Apparatus in accordance with claim 11, in which the color selectivemeans comprises at least two repeating patterns each comprised of atleast three color filter bands responsive to different color componentsand having adjacent portions for transmitting to the lens means twoseries of strip images of which the strips in each series represent afull complement of primary colors.

13. Apparatus according to claim 11, in which the color selective meanscomprises at least two color filter bands having adjacent portionshaving separate color-selective qualities for transmitting to the lensmeans adjacent strip images of the A different color components in theoriginal scene.

14. Apparatus as set forth in claim 13, in which the color filter bandsare in overlapping relationship.

15. Apparatus according to claim 13, in which the transverse dimensionsof adjacent portions of the color filter bands are unequal.

16. Apparatus according to claim ll, in which the optical meansincludes:

means for averaging the luminance content of the original scene; and

image-forming means receiving the averaged luminance content and formingtherefrom the elongated areas of illumination of the first series.

17. Apparatus according to claim 16, in which the luminance-averagingmeans and color-selective means are in separate optical paths betweenthe original scene and photographic medium.

18. Apparatus according to claim 17, in which the luminance-averagingmeans comprises a surface disposed to receive and diffusely reflect tothe frame areas illuminations from the original scene.

19. Apparatus as defined in claim ll, in which the optical means iseffective to provide elongated illuminated areas having a transversedimension of about one-half the corresponding dimension of the areas ofthe second series.

20. Apparatus as defined in claim 11, in which the areas of illuminationof the first series directed to the frame area by the optical means havetransverse dimensions which are equal.

21. Apparatus according to claim 11, in which the lens means comprises aparallel lenticular array of plane-convex cylindrical lenses, eachfocusing an area of the second series onto the frame area of the medium.

22. Apparatus according to claim 21, in which each lens of thelenticular array also focuses a pair of areas of illumination of thefirst series onto the frame area of the medium.

23. In combination with apparatus according to claim 11, a photographicmedium in which the color-selective means is contained on thephotosensitive surface of the medium.

24. The combination of claim 23, in which the lens means forms anintegral part of the film and is superimposed on the color selectivemeans of the film.

25. Apparatus as defined-in claim 11, in which the means includes:

an independent source of illumination; and

image-forming means receiving illumination from the independent sourcefor presenting to the frame area an image of at least two relativelycontrasting, elongated image areas of illumination.

26. Apparatus according to claim 11, further comprising means fordirecting to an adjacent frame area of the photographic medium apictorial luminance image of the original scene.

optical 27. Apparatus according to claim 26, in which the colorselectivemeans comprises at least two adjacent dichroicminor elements disposed toreflect displaced images of different color components on the originalscene to the frame area of the medium and to transmit non-reflectedcomponents of the original scene image to the adjacent frame area of themedi- 28. Apparatus according to claim 11, in which the apparatusincludes means forming a first, luminance image chamber and a second,chrominance image chamber, the image of the first series of areas beingreceived in the first chamber and the image of the second series ofareas being received in the second chamber.

Page 1 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3,535,992 D d October 27, 1970 Inventor(s) Peter C. Goldmark and WilliamE. Glenn, Jr.

It is certified that error appears in the above-identified patent andthat said Letters Patent are hereby corrected as shown below:

Substitute the following drawing for Figure 6 Page 2 UNITED STATESPATENT OFFICE CERTIFICATE OF CORRECTION patent N 3,535,992 Dated ctober27, 1970 Inventor(s) Peter C. Goldmark and William E. Glenn, Jr.

It is certified that error appears in the above-identified patent andthat said Letters Patent are hereby corrected as shown below:

In column 6, line 14, change "FIG. 9" to FIG. l0--; line 33, change"FIG. 8" to FIG. l0--; line 44, change "FIG. 10" to FIG. 9-; and line47, change "FIG. 8" to FIG. l0-.

On the cover page, first column, item "72" line 2, change William E. Jr.Glenn" to William E. Glenn, Jr.-.

In column 4, line 37, change "or" to --of--.

In column 5, line 65, insert after "39 In column 6, line 52, change"alternation" to --alteration-.

In column 7, line 9, change "I claim:" to We claim:-.

In column 9, line 2 (claim 27) change "dichroicminor" to dichroicmirror--.

sia'nmmw sumo Ills 1971 ml. G- 0m Dominicanof Patents

